Dana 70 1990 w250 cummins - Dodge Cummins Diesel Forum
89-93 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #1 of 21 (permalink) Old 12-11-2019, 07:36 PM Thread Starter
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Dana 70 1990 w250 cummins

Haven't measured my axle tubes yet but wondering if our 1st gens had the 70hd in them or the 70u

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post #2 of 21 (permalink) Old 12-11-2019, 08:03 PM
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I believe I have seen it mentioned that both can be found under a 1st gen.

1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 370K Km's, hydroboost, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.
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post #3 of 21 (permalink) Old 12-11-2019, 08:46 PM
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I know for a fact in 1991 Dodge equipped the D&W 250s and SRW W350s with the DANA 60 rear axle at 5500 lbs. So I would think your W250 would be a DANA 60

1991.5 Dodge W350 Cab & Chassis DRW Cummins 5.9 Getrag 360 - 4" Diamond Eye Exhaust

Last edited by moxiecat; 12-11-2019 at 09:06 PM.
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post #4 of 21 (permalink) Old 12-11-2019, 09:18 PM
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Originally Posted by moxiecat View Post
I know for a fact in 1991 Dodge equipped the D&W 250s and SRW W350s with the DANA 60 rear axle at 5500 lbs. So I would think your W250 would be a DANA 60
whered ya hear that?
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post #5 of 21 (permalink) Old 12-11-2019, 09:37 PM
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My 1991 FSM & Sales Brochure.

1991.5 Dodge W350 Cab & Chassis DRW Cummins 5.9 Getrag 360 - 4" Diamond Eye Exhaust
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post #6 of 21 (permalink) Old 12-11-2019, 09:46 PM
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If it has the diesel from the factory and the axle hasn't been swapped, it will be a D70 rear and D60 front for W series 250/350. The W250 of that era should be a D70U rear.

1993 W250 LE Club Cab Long Bed, auto.
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post #7 of 21 (permalink) Old 12-11-2019, 09:54 PM
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If it has the diesel from the factory and the axle hasn't been swapped, it will be a D70 rear and D60 front for W series 250/350. The W250 of that era should be a D70U rear.
^^^ yep, the diesels came with 70s the gas trucks had 60s the diesels have 60s up front (4x4s) while the gas trucks have dana 44s up front... the diesels 250s and 350s both had 70s in em... as I just discovered after doing some research for 1tondually... I just assumed Dodge had put 80s in the 1 tons but nope not till later years as I told him .. its sad but just one more + for Chevy as they at least put big bad 14 bolts in their 1 tons back theneven in their gas trucks
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post #8 of 21 (permalink) Old 12-11-2019, 10:04 PM
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FSM-Boy, you really can't believe everything you read.

1991.5 Dodge W350 Cab & Chassis DRW Cummins 5.9 Getrag 360 - 4" Diamond Eye Exhaust
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post #9 of 21 (permalink) Old 12-11-2019, 11:29 PM
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FSM-Boy, you really can't believe everything you read.
diesels also have a heavier frame as well 8" versus 5" for gas trucks, thats why I bought my 93 when I decided to convert 71 Blazer to 12 valve.. plan was to shorten the truck frame and use it as well under the Blazer as its higher tensile rated steel as well as taller but the thing was so clean and fired right up after sitting 10 years I couldn't chop it up...
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post #10 of 21 (permalink) Old 12-12-2019, 03:08 AM
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I have two cab & chassis 1-tons... (75 D300 & 77 W300) both have a 70B. Its a heavier casting, 3.5" tubes, and uses larger pinion bearings than the 70U.

The 70HDs I have encountered (GM and Ford) had 4" tubes. Not sure what a D/W450 would have used.

AFAIK, once the 70B ran its course, the 70U replaced it. First in the same 35-spline format, and then around 91/92 became 32 spline instead (bolts retaining axles shafts instead of cones & nuts).

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diesels also have a heavier frame as well 8" versus 5" for gas trucks, thats why I bought my 93 when I decided to convert 71 Blazer to 12 valve.. plan was to shorten the truck frame and use it as well under the Blazer as its higher tensile rated steel as well as taller but the thing was so clean and fired right up after sitting 10 years I couldn't chop it up...
I think you mean 6" channel on the gas trucks (7" on heavier ones). Most non-IC diesels have a 6" channel too.

93 W250 Club 6BTA |5spd |60/80/3.54/Lockright |4" lift |315/75R16 |HX35 |5x.012s |BD pin & gov spring
90 D250 6BT |5spd |D60/3.54/Lockright
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post #11 of 21 (permalink) Old 12-12-2019, 08:51 AM
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Originally Posted by u2slow View Post
I have two cab & chassis 1-tons... (75 D300 & 77 W300) both have a 70B. Its a heavier casting, 3.5" tubes, and uses larger pinion bearings than the 70U.

The 70HDs I have encountered (GM and Ford) had 4" tubes. Not sure what a D/W450 would have used.

AFAIK, once the 70B ran its course, the 70U replaced it. First in the same 35-spline format, and then around 91/92 became 32 spline instead (bolts retaining axles shafts instead of cones & nuts).



I think you mean 6" channel on the gas trucks (7" on heavier ones). Most non-IC diesels have a 6" channel too.
only ones I've dealt with are 92/93s and yea might be 7" been awhile since I measured em, was back when I was looking to convert onea my Blazers to 12 valve and realized I'd be much better off using the 93s frame as well etc.. then folks on here told me the gas trucks were only 5" Never measured one myself and only trucks I've been looking at buying up for parts doners have all been 92/93... and all 4 of em have 70s under them so... learned a long time ago that the books are just a refference not the bible as been restoring old iron most of my life and seldom has the info in the manuals matched what I actually found in the vehicles...
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post #12 of 21 (permalink) Old 12-12-2019, 01:10 PM
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Originally Posted by monsoon-mech View Post
him .. its sad but just one more + for Chevy as they at least put big bad 14 bolts in their 1 tons back theneven in their gas trucks
I was under the impression from my reading that the 14-bolt GM axle is roughly equivalent to the Dana 70s found in these trucks.

1993 W250, G-360 manual completely stock.
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